Transcript The Boundary and Annexation Survey (BAS) U.S. Census Bureau Geography Division & National Processing Center •1

The Boundary and Annexation Survey
(BAS)
U.S. Census Bureau
Geography Division
&
National Processing Center
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Outline
1. Census Bureau Geographic Entities and Concepts
2. Introduction to the BAS
3. Introduction to Digital BAS
4. Digital BAS (ArcGIS & MTPS) Demonstration
5. Paper BAS Demonstration
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Overview of Census Bureau
Geographic Areas
and
Concepts
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Census Geographic Areas
Legal Areas:
Statistical Areas:
•States
•Counties
•Minor civil divisions
•Incorporated places
•Congressional districts
•Legislative areas
•School districts
•Urban growth areas
•Census county divisions
•Census designated places
•Census tracts
•Census blocks
•Metro and micropolitan statistical areas
•Urban areas
•Public use microdata areas
•Traffic analysis zones
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Hierarchy of Census Geographies
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American Indian Areas (AIA) Hierarchy
• American Indian Reservations (federal) &
Off-Reservation Trust Land
Tribal Subdivision
Tribal Census Tract
• Tribal Block Group
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Small Geographic Areas
Blocks:
Block Groups:
• Smallest units for
decennial Census data
tabulation
• Groups of blocks
sharing first digit of
block number
• Cover entire nation
• Smallest units for
tabulation of American
Community Survey
(ACS) data
• Nest within all other
types of geographic
areas
• Generally bounded by
visible features or
boundaries
• Population ranges
from 1,000 to 3,000
• Nest within census
tracts
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Census Tracts
• Small, relatively permanent statistical
subdivisions of a county
• Relatively consistent boundaries over time
• Size: optimally 4,000 people; range between
1,000 and 8,000
• Approximately 74,000 census tracts in U.S.
• Defined nationwide for the first time in Census
2000; however Block Numbering Areas (BNAs)
and tracts covered the entirety of the nation in
1990
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County Subdivisions
Minor Civil Divisions (MCDs)
• Legally bounded entity
• Sub-county entities in 29 states, Puerto Rico, and the
Island Areas
• May have a formal government with elected officials
Census County Divisions (CCDs)
• Statistical entity
• Sub-county units that have stable boundaries and
recognizable names in 21 states
• Designed to be a statistical equivalent to MCDs
• No minimum or maximum population requirement
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Minor Civil Division (MCD)
• Township and Town – the most common names
• Other MCD names:
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Election district
Magisterial district
Parish governing authority district (Louisiana only)
Supervisor district (Mississippi only)
Election precinct (Illinois and Nebraska)
Gore (Maine and Vermont)
Grant (New Hampshire and Vermont)
Location (New Hampshire only)
Plantation (Maine only)
Purchase (New Hampshire only)
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Places
Incorporated Places
• Legally bounded entity
• Depending on the state, examples include cities,
boroughs, towns, and villages
Consolidated Cities
• Legally bounded entity
• Incorporated place that has consolidated its
government functions with a county or sub-county.
• Ex: Indianapolis, IN and Louisville, KY
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Places
Census Designated Places (CDPs)
• Statistical entity
• Created to present census data for an area having
a concentration of population, housing, and
commercial structures
• Boundaries delineated by the Census Bureau, with
assistance from planning organizations
• Locally identifiable name
• Not inside an existing incorporated place
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Places
Census Designated Places (CDPs)
•Source: http://www.public-domain-photos.com/
Example: Paradise, Nevada
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Geographic Identifiers
Code Sets:
• Federal Information Processing Series (FIPS)
• American National Standard Institute (ANSI)
• Census Bureau (BAS Code)
Code Examples:
Area
State
County
Place
Name
North Carolina
Transylvania
Wilmington
FIPS Code
37
175
74440
ANSI Code
01027616
01008589
02405754
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BAS Codes
There are 5 types of entities recognized for the BAS:
Entity Code
Entity Type
.
0
Consolidated City
1
Incorporated Place
2
County or County Equivalent
3
Minor Civil Division (MCD)
4
Federally recognized American Indian
reservations and off-reservation trust
lands
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BAS Codes
• The BAS entity code is an 11-Digit Code
• Entity types 0 through 3 use FIPS codes
• Entity type 4 uses unique code developed by Census
Entity Type
{0, 1, 2, 3, 4}
County FIPS
Code
9 99 999 99999
State FIPS
Code
Entity FIPS
Code
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BAS Codes (Place)
Example: Wilmington (city), NC
Entity Type
{0, 1, 2, 3}
County FIPS
Code
1 37 000 74440
State FIPS
Code
Entity FIPS
Code
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BAS Codes (County)
Example: Transylvania County, NC
Entity Type
{0, 1, 2, 3}
County FIPS
Code
2 37 175 00000
State FIPS
Code
Entity FIPS
Code
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BAS Codes (Minor Civil Division)
Example: Long Creek Township, ND
Entity Type
{0, 1, 2, 3}
County FIPS
Code
3 38 023 47780
State FIPS
Code
Entity FIPS
Code
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BAS Codes (American Indian Area)
Example: Navajo Nation Reservation
Entity Type
{4}
Example:
Navajo
Reservation and
Off Reservation
Trust Land
Tribal Name (TR)
Code
4 99 0161 2430
State FIPS
{99}
Tribal Area (TA)
Code
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Census Bureau
Geographic Products
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Packet Materials
• 2010 Census Data Products: United States
• 2010 TIGER/Line Shapefiles Flyer
• Standard Hierarchy of Census Geographic Entities
• Map of 2010 Population Distribution in the United States
• Working with TIGER/Line Shapefiles: Downloading
• Working with TIGER/Line Shapefiles: Downloading from AFF
• American FactFinder Flyer
http://www.census.gov/geo/www/index.html
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Key Census Data Products
• December 31, 2010 – Apportionment Data to the President
• Feb to Mar 2011 – Redistricting Data
• Nov 2010 to Jan 2011 – Redistricting Geographic Files
• Oct 2012 – Urban/Rural Data
• Jul to Aug 2013 – Core-Based Statistical Areas Data
– Metropolitan Statistical Areas
– Micropolitan Statistical Areas
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TIGER/Line Shapefiles
• Public product created from the MAF/TIGER database
• Digital files containing geographic features (roads,
rivers, legal & statistical boundaries, address ranges,
etc.), including information about the features and their
location
• Covers United States, Puerto Rico, and Island Areas
• 2010 Shapefiles released state-by-state from
December 2010 – February 2011
• Updated data is released yearly
• www.census.gov/geo/www/tiger/index.html
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TIGERweb
•http://tigerweb.geo.census.gov/tigerwebmain/tigerweb_main.html
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BAS Homepage
http://www.census.gov/geo/www/bas/bashome.html
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Reference Maps: Census Geography
Census Tract
Outline Maps
Census Block
Outline Maps
•http://www.census.gov/geo/www/maps/CP_MapProducts.htm
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Reference and Thematic Maps
American Indian and
Alaska Native Areas
Population Distribution
of the U.S.
•http://www.census.gov/geo/www/maps/CP_MapProducts.htm
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